The Role of Depth and 1/f Dynamics in Perceiving Reversible
D. J. Aks
Department of Psychology, University of Wisconsin - Whitewater,
Whitewater, WI 53190
J. C. Sprott
Department of Physics, 1150 University Ave, University
of Wisconsin - Madison, Madison, WI 53706
When confronted with a reversible figure, such as the Necker Cube,
experience a spontaneously changing percept. We assess the dynamic of
the human visual system resolves perceptual ambiguity in stimuli that
multiple interpretations. Subjects observed the Necker cube for one of
three viewing durations during which they pressed a key each time they
perceived a change in the orientation of the cube. Manipulations of
disparity served as a parameter to control perceptual stability.
conditions yielded more perceptual reversals than high-depth
A Fourier analysis performed on the time series of reversals show 1/f
(pink) noise was evident in their power spectra. These results together
with theoretical models of complex systems (e.g., Bak, Tang, &
1987) suggest that depth information may guide our perceptual system
a self-organized state to assist us in resolving ambiguous information.
Moreover, slopes of the spectra were steeper in high-depth and brief
conditions, suggesting that the visual system relies more on previous
states and filters more white noise in these conditions.
Ref: D. J. Aks and J.
C. Sprott, Nonlinear Dynamics, Psychology, and Life Sciences 7,
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